Combined door latch and lock



NOV. 11, 1941. J R U 2,262,284

COMBINED DOOR LATCH AND LOCK Filed Sept. 22, 1939' 2 Sheets-Sheet l IN VEN TOR.

ATTORNEYS.

Nov. 11, 1941. J, R, HULL COMBINED DOOR LATCH AND LOCK Filed Sept. 22,1939 2 Sheets-Sheet 2 /0 d IN V EN TOR.

ATTORNEYS.

Patented Nov. 11, 1941 UNITED STATES PATENT OFFICE COMBINED DOOR LATCHAND LOCK John R. Hull, Detroit, Mich.

Application September 22, 1939, Serial No. 296,137

3 Claims.

This invention relates to combined door latch and lock construction, theprimary object of the invention being to provide a door latch whereinthe spindle thereof is constructed to operate the sliding bolt or latchof the lock, in a horizontal plane by pushing or pulling the handles orknobs secured to the ends of the spindle.

An important object of the invention is to provide a door latch of thischaracter having means whereby the spindle may be locked againstmovement to prevent the operation of the latch and opening of theclosure on which the latch is mounted, by unauthorized persons.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein described, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawings:

Figure 1 is a sectional view through a latch and door lock constructedin accordance with the invention.

Figure 2 is a sectional view taken on line 22 of Figure 1.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4 is an enlarged sectional view taken at right angles to Figure3.

Figure 5 is an enlarged sectional view through a portion of the combinedlock and latch, illustrating the locking cone as moved to its inactiveposition.

Referring to the drawings in detail, the latch housing is indicatedgenerally by the reference character 5 and the reference character 6designates the keeper plate of the latch, which is provided with theusual sliding bolt opening to receive the sliding bolt, which in thepresent showing is indicated by the reference character I. Secured tothe sliding bolt 1 and extending inwardly from the inner end thereof, isa bolt 8 on which the coiled spring 9 is mounted, one end of the coiledspring engaging the inner end of the sliding bolt T, while the oppositeend thereof engages the washer III that bears against the bifurcated endI I of the lever I2, which is pivotally mounted within the housing.Connected with the lever I2, at a point above the pivot thereof, i alink I3 that has one end thereof connected to the upper arm of thebell-crank lever I I, at

I5. The opposite arm of the bell-crank lever I 4 extends rearwardlywithin the latch housing where it engages the sliding spindle I6 orspindle of the latch. The spindle I6 is formed with a cut-out portiondefining an inclined surface I! against which the inner end of thebell-crank lever I4 engages. A coiled spring indicated at I8 is mountedwithin the sliding spindle I6, and bears against the pin I9 that extendstransversely through the slot 20 formed in the spindle. Thus it will beseen that due to this construction, the sliding spindle l6 will benormally urged to the position as shown by Figure 2 of the drawings.

A coiled spring indicated at 2| is connected with the lever I2, near thebifurcated end thereof, the opposite end of the spring being anchored tothe plate 22 that is secured within the latch housing 5. This spring 2Iacts to return the lever I2 to its normal position as shown by Figure 3,after it has been actuated to unlock 0r unlatch the door.

The locking means for holding the sliding bolt 1 against movement,includes the substantially cone-shaped head 23 which is carried at theinner end of the rod 24 which in turn extends through the escutcheonplate 25, where it connects with the handle 26 carried at the inner endof the sliding spindle I6, through the medium of the pin 24' that movesin the groove 25 formed in the rod 24. Due to this construction, the rod24 is free to rotate within the handle 26 but is secured to the handleto slide therewith. The connections between the handle 26 and slidingspindle I6 is such that the handle 26 is permitted to move slightly withrespect to the sliding spindle I6. A pin indicated at 21 extends throughan elongated opening formed in the sliding spindle I6 and connects withthe handle 26, as clearly shown by Figure 2 of the drawings. A coiledspring indicated at 28 is fitted within an opening at one end of thesliding spindle I6 and bears against the pin 21 normally urging thehandle 26 inwardly towards the door or closure on which the latch isused.

The cone-shaped head 23 is provided with a flattened portion 29 which isso disposed that when the cone-shaped head has been moved to apredetermined position, the flattened portion will lie directly oppositeto the inner end of the link I3, permitting of slight movement of thelink I3, for purposes to be hereinafter more fully described.

As clearly shown by Figure 5 of the drawings, the cone-shaped head 23 isformed with a rectangular opening for the reception of the lock bar 30which is also rectangular in cross section to closely fit within theopening but at the same time permit of movement of the cone-shaped head23 with respect to the bar.

The bar 30 extends into the lock barrel 3| which is actuated in theusual manner, by the I In the operation of the lock or latch, when thesliding bolt and bell-crank lever with its connected parts, are in thepositions as shown in full lines in Figure 3 of the drawings, and thehead 23 is in a position to be engaged by the inner end of link l3, thesliding bolt 1 is in its locked position. In other words, with theelements in this position, it would be impossible to move the outerhandle to slide the spindle 16 to operate the bellcrank lever." In orderto allow for movement of the bell-crank lever and its connected parts,it is necessary to rotate the lock bar-3|] to move the head 23 until theflattened portion thereof is directly opposite to the inner end of linkl3. With the flattened portion in this position, there is sufflcientclearance to allow the link l3 to move towards the head 23. It isobvious that upon further sliding movement of the sliding bar 30, thehead 23 will be moved to the position as shown by Figure 5 of thedrawings, allowing clearance to permit the movement of the bell-cranklever 14, link l3 and lever I2, to the positions shown in dotted linesin Figure3, whereupon the sliding bolt 1 is retracted from the keeperplate opening.

It is obvious that when the handle 33 is released, the handle togetherwith its spindle l6, as well as the head 23, will be returned to theirnormal positions.

Should it be desired to operate the sliding bolt by means of the handle26, which is, the inner handle of the latch, it is only necessary topull the handle 26 towards the operator. As'the handle is moved, the rod24 and head '23 are moved out of the path of travel of the inner endofthe link; l3, allowing the inclined surface of the spindle it to moveover the lower arm of theibellcrank lever M, to actuate the elements'ofthe latch.

f bolt operating within the latch housing, a slid- In view of theforegoing detail disclosure, a further description as to the operationof the device is believed unnecessary.

What is claimed is:

1. In a door latch, a latch housing, a sliding bolt operating within thehousing, pivotally connected levers connected with the bolt and adaptedto operate the sliding bolt, a slidable rotary locking member. disposedwithin the path of travel'of said levers preventing movement of saidlevers and bolt, means for sliding the locking member to disengage saidlevers, and means for moving the levers and sliding bolt to theirunlocked position.

"2. In a door latch, a latch housing, a sliding ing spindle movablethrough the housing, levers operated by said spindle and adapted tooperate the sliding bolt, 2. head movable within the housing andengaging one of the levers preventing movement of said levers andsliding bolt, means at one side of the housing for sliding the head outof contact with said levers, said head having a reduced portion, andmeans at the opposite side of the housing for rotating the head, wherebythe reduced portion of the head rests'opposite to said levers providinga clearance for said levers permitting movement of the levers andsliding bolt.

3. In a door latch, a latch housing, a sliding bolt movable through thelatch housing, a plurality of connected levers mounted within thehousing, one of said levers being connected to the sliding bolt, asliding spindle having a cam suriace adapted to move over one of saidlevers operating the levers and'sliding bolt when the spindle is movedin one direction, means for locking the levers and sliding bolt againstmovement, said means embodying a head having a tapered inner end, saidhead normally engaging one of said levers preventing movement of thelevers .and sliding bolt, said head having a flattened portion providinga clearance, means at one side of the housing for rotating said headwhereby the flattened portion thereof. is moved opposite to the leverspermitting a clearance allowing movement of the levers and sliding bolt,and means at the opposite side of the housing for sliding the head awayfrom said levers permitting movement of the levers and bolt.

JOHNR.

